Plot-phylo

Updated automatic pip release workflow only

**Full Changelog**: https://github.com/KatyBrown/plot_phylo/compare/0.1.10...0.1.11

Changes for pyOpenSci review as follows:

- Updated README.md and CONTRIBUTING.md to include additional information
- Added testing information to the readthedocs manual
- Added metadata to pyproject.toml
- Added a github workflow for publishing to pip
- Added linting with flake8 to CI testing

Minor update:
* Added Python versions 9 to 12 to unit testing

Minor update:
* Added to documentation and moved to ReadTheDocs
* Updated testing to include Python 3.9

Minor update:
* Improved testing to ensure 100% test coverage
* PEP8 compliance
* Update to CONTRIBUTING.md

New release including:
- Unit tests
- CI testing
- Code of conduct, contribution instructions
- Additional options - highlighting leaves in bold, setting outgroup